What is LN2807 6S 1300KV 5S 1500KV 4S 1700KV Brushless Motor?

Introduction: Decoding the "Identity Cipher" of FPV Motors

Have you ever encountered a string of letters and numbers like "LN2207 1700KV" or "LN2807 1500KV" and wondered what it truly means? This code is not random; it is the standardized language of brushless motor specifications, revealing everything about its physical build and performance potential.

Deciphering this code is the first step to mastering your drone's powertrain. It tells you the motor's size, its inherent speed characteristic, and what voltage it's designed for. Understanding this "identity cipher" allows you to move beyond guesswork and make an informed, technical decision when selecting the perfect motor for your FPV drone, whether it's for aggressive racing, long-range endurance, or agile freestyle flying. Let's break down this essential nomenclature.

Chapter 1: Anatomy of "LN2807" - Understanding the Motor's Steel Frame

The alphanumeric code "LN2807" serves as the core identifier for the motor's physical dimensions. It describes the fundamental size and power potential of its core component: the stator.

• Decoding "28" and "07": The first two digits, "28," refer to the diameter of the stator in millimeters. A larger stator diameter generally allows for greater torque output. The last two digits, "07," indicate the height of the stator, also in millimeters. The stator height is closely related to the motor's efficiency and its overall torque characteristics.
• The Role of Stator Size: This specific 28x7mm configuration represents a popular balance in the FPV world. It provides a robust foundation capable of generating significant power and torque, making it a suitable choice for larger propeller sizes, such as those found on 7-inch racing drones or heavy-lift craft, without becoming excessively heavy. The design prioritizes a effective compromise between raw thrust capability, operational efficiency, and thermal management.

In essence, the "LN2807" designation defines the motor's physical architecture—its "steel frame." This sets the absolute baseline for its performance capabilities, upon which other factors like KV rating and operating voltage build.

Chapter 2: Decoding "1300KV/1500KV/1700KV" - The Speed Soul of the Motor

While the stator size defines the motor's physical body, the KV rating represents its "speed soul." The KV constant, measured in RPM per Volt (RPM/V), indicates the motor's theoretical no-load speed per applied volt. Understanding KV is crucial, as it directly dictates the motor's inherent speed and torque characteristics.

A higher KV value signifies a motor designed for higher rotational speeds with lower inherent torque, akin to a sprinter. Conversely, a lower KV rating indicates a motor built for higher torque output at lower rotational speeds, similar to a weightlifter. This fundamental relationship is key to matching a motor to your specific application.

The following table compares the general performance characteristics associated with different KV ratings for a given stator size, such as the 2807:

It is critical to remember that KV rating and stator size are interdependent. A high KV rating on a small stator will behave very differently than the same KV on a large stator. Furthermore, selecting an inappropriately high KV motor for a high-voltage battery can lead to excessive current draw and potential failure. Therefore, the KV rating must always be considered in the context of the motor's physical size and the intended operating voltage.

Chapter 3: Connecting "4S/5S/6S" - Voltage is the Fuel That Ignites Everything

The stator size defines the engine's potential, and the KV rating sets its speed character, but it is the battery voltage—denoted by its cell count or "S" (e.g., 4S, 5S, 6S)—that acts as the fuel, ultimately determining the final power output and flight experience. Voltage is the critical multiplier in the power equation.

The relationship between KV and voltage is fundamental. A motor's unloaded RPM is calculated as Voltage * KV. Therefore, to achieve a similar target RPM range across different power systems, the KV rating must be inversely adjusted to the voltage. This principle explains why a motor series offers different KV versions for different battery setups.

The following table illustrates how these elements work together for a stator size like 2807, creating distinct performance profiles:

Critical Consideration: System Compatibility

Selecting the correct KV for your intended voltage is not a suggestion—it is a requirement. Mismatching a high-KV motor with a high-voltage battery (e.g., a 1700KV motor on a 6S pack) will cause the motor to attempt to spin at an unsustainable RPM, drawing excessive current and leading to rapid failure of the motor or electronic speed controller (ESC). Always consult manufacturer specifications to ensure a safe and efficient powertrain combination.

Chapter 4: Practical Guide: How to Unleash Your Motor's Full Potential?

Selecting the right motor is only the first step. Integrating it correctly with other core components is essential to unlock its full performance, ensure reliability, and achieve your desired flight characteristics. This chapter provides a practical guide to system matching.

The key to optimal performance lies in the synergy between the motor's KV rating, the battery voltage, the propeller size, and the Electronic Speed Controller (ESC). The following table outlines recommended component pairings for different performance goals, using a common stator size as a basis:

Essential Pre-flight Checklist:

• Secure Mechanical Connection: Ensure the motor is firmly attached to the frame and the propeller is correctly mounted and balanced to prevent vibrations.
• Verify ESC Configuration: Use appropriate software to confirm your ESC firmware is up-to-date and settings like startup power, timing, and braking are configured correctly for your motor.
• Monitor Thermal Management: After the first flights, check the temperatures of both the motors and ESCs. Consistently hot components indicate an inefficient setup or excessive load.
• Respect the Limits: Understand that pushing components beyond their design limits—such as using overly aggressive propellers on a high-KV system—will lead to premature failure.

Conclusion: From a String of Characters to a Design Philosophy

What begins as an obscure sequence of letters and numbers—LN2807 6S 1300KV—reveals itself, upon decoding, as a coherent and intelligent design philosophy. It is no longer just a product model; it is a testament to the precise engineering and thoughtful compromise that underpins high-performance drone systems.

This philosophy is built on a fundamental trinity of factors:

• The Physical Foundation (Stator Size): The "28" and "07" define the motor's potential for torque and its ability to handle power.
• The Operational Character (KV Rating): The "1300KV" dictates the motor's inherent relationship between speed and torque.
• The Energy Input (Battery Voltage): The "6S" specifies the electrical environment that will unleash the motor's potential.

The true mastery for any pilot lies in understanding the dynamic interplay between these elements. The following table encapsulates this holistic philosophy:

Ultimately, this knowledge transforms your perspective. You stop seeing isolated components and start seeing an integrated powertrain system. You learn that there is no single "best" motor, only the perfect synergy of components for your specific frame, propeller, and flight ambition. This understanding is the key to moving from simply assembling parts to expertly engineering a flying machine.

FAQ

1. How do I choose the right KV rating for my specific drone application?

The optimal KV rating depends on your battery voltage (S-count), drone weight, and flight style (e.g., racing vs. long-range). As a guide, lower KV (e.g., 1300-1500) pairs well with higher voltages (6S) for torque-heavy applications, while higher KV (1700+) suits lower voltages (4S) for responsive, high-RPM flight. Unlike other motor suppliers, Retek's engineering system prevents the selling of our motors by catalogue as every model is customized for our customers. We work closely with you to determine the perfect KV and stator size combination for your exact specifications.

2. Can I use the same motor across different drone sizes and types?

While technically possible, it's not optimal. Motor performance is a system of stator size, KV rating, and voltage. Retek's business consists of three integrated platforms: Motors, Die-Casting and CNC manufacturing, and wire harness. This allows us to provide total solutions where every component - from the motor windings to the housing - is engineered as a cohesive system for your specific drone type, whether it's for FPV racing, aerial photography, or industrial inspection.

3. What makes Retek motors different from other brushless motors in the market?

Unlike catalogue-based suppliers, Retek provides fully customized solutions where each motor is engineered to your exact requirements. Our customers are assured that every component they receive from Retek is designed with their precise specifications in mind. With our three specialized platforms - Motors, Die-Casting/CNC, and wire harness - we deliver complete, optimized systems. Welcome to send us an RFQ; it is believed you will get the best cost-effective products and services here, backed by our close working partnership approach that combines innovation with practical application expertise across various fields including drones, automotive, and medical facilities.